How to forward declare variables in Python

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I would like to know how to forward declare variables in Python. I have attached a program here. Please if anyon e has time please look at it. It is a pizza ordering program. SGST and CGST are taxes in my country. I have added the taxes to the final price and it is printing the final price as well. But I want to print SGST & CGST individually ( CGST = SGST = 2.5% of final price ). Please help me if you know.